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    </style></head><body><div id="header"><div id="title">WebPerfWG call minutes - November 5th 2019</div><div id="interval"><span></span></div></div><div id="contents"><style type="text/css">ul.lst-kix_tqsdlr8l2mxc-5{list-style-type:none}ul.lst-kix_tqsdlr8l2mxc-6{list-style-type:none}ul.lst-kix_tqsdlr8l2mxc-3{list-style-type:none}ul.lst-kix_tqsdlr8l2mxc-4{list-style-type:none}ul.lst-kix_tqsdlr8l2mxc-7{list-style-type:none}ul.lst-kix_tqsdlr8l2mxc-8{list-style-type:none}ul.lst-kix_vmuch2tiypnh-5{list-style-type:none}ul.lst-kix_vmuch2tiypnh-4{list-style-type:none}ul.lst-kix_vmuch2tiypnh-7{list-style-type:none}ul.lst-kix_vmuch2tiypnh-6{list-style-type:none}ul.lst-kix_tqsdlr8l2mxc-1{list-style-type:none}ul.lst-kix_tqsdlr8l2mxc-2{list-style-type:none}ul.lst-kix_vmuch2tiypnh-8{list-style-type:none}ul.lst-kix_tqsdlr8l2mxc-0{list-style-type:none}.lst-kix_vmuch2tiypnh-0>li:before{content:"\0025cf  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class="c13"><p class="c11"><span class="c1">Ross McIlroy, Ryosuke Niwa, Thomas Kelly, Steven Bougnon, Yoav Weiss, Phillipe Le Hegaret, Nicol&aacute;s Pe&ntilde;a, Ilya Grigorik, Nic Jansma, Will Hawkins, Subrata Ashe, Benjamin De Kosnik</span></p><h2 class="c8" id="h.aq6atu1vxro5"><span class="c6">Next call</span></h2><ul class="c4 lst-kix_tqsdlr8l2mxc-0 start"><li class="c7 li-bullet-0"><span class="c1">November 19th @ 11AM PST </span></li></ul><p class="c5"><span class="c1"></span></p><h2 class="c8" id="h.m48dn8rcg98h"><span class="c6">requestIdleCallback</span></h2><ul class="c4 lst-kix_vmuch2tiypnh-0 start"><li class="c7 li-bullet-0"><span class="c9"><a class="c2" href="https://www.google.com/url?q=https://github.com/w3c/requestidlecallback/issues/82&amp;sa=D&amp;source=editors&amp;ust=1613235188125000&amp;usg=AOvVaw0dMBgOV8-ubpv643wmaySN">https://github.com/w3c/requestidlecallback/issues/82</a></span></li></ul><ul class="c4 lst-kix_vmuch2tiypnh-1 start"><li class="c0 li-bullet-0"><span class="c1"><b>Ross</b>: spec bug, have a PR that should address it</span></li></ul><ul class="c4 lst-kix_vmuch2tiypnh-2 start"><li class="c3 li-bullet-0"><span><b>PR</b>: </span><span class="c9"><a class="c2" href="https://www.google.com/url?q=https://github.com/rmcilroy/requestidlecallback/pull/1&amp;sa=D&amp;source=editors&amp;ust=1613235188126000&amp;usg=AOvVaw37L1cQqK_N60JMICcSeVG2">https://github.com/rmcilroy/requestidlecallback/pull/1</a></span></li></ul><ul class="c4 lst-kix_vmuch2tiypnh-1"><li class="c0 li-bullet-0"><span class="c1"><b>Ryosuke</b>: why doesn’t each event loop have a list of idle callbacks?</span></li></ul><ul class="c4 lst-kix_vmuch2tiypnh-2 start"><li class="c3 li-bullet-0"><span class="c1">Instead of associating with group of similar agents, have it be connected to agent that similar agents share</span></li></ul><ul class="c4 lst-kix_vmuch2tiypnh-1"><li class="c0 li-bullet-0"><span class="c10"><b>AI</b>: Ryosuke to followup on PR with suggested approach</span></li></ul><ul class="c4 lst-kix_vmuch2tiypnh-2 start"><li class="c3 li-bullet-0"><span class="c1">We might want to PR whatwg spec to add concept of idle queues</span></li></ul><ul class="c4 lst-kix_vmuch2tiypnh-0"><li class="c7 li-bullet-0"><span class="c9"><a class="c2" href="https://www.google.com/url?q=https://github.com/w3c/requestidlecallback/issues/71&amp;sa=D&amp;source=editors&amp;ust=1613235188127000&amp;usg=AOvVaw0G95XgmDg6ASwKe9IJ3LLj">https://github.com/w3c/requestidlecallback/issues/71</a></span></li></ul><ul class="c4 lst-kix_vmuch2tiypnh-1 start"><li class="c0 li-bullet-0"><span class="c1"><b>Ryosuke</b>: this should talk about event loop and task sources</span></li><li class="c0 li-bullet-0"><span class="c1">… anytime there is a pending task, we should not be scheduling </span></li><li class="c0 li-bullet-0"><span class="c1"><b>Ross</b>: this issue is about predicting the deadline</span></li><li class="c0 li-bullet-0"><span class="c1"><b>Ryosuke</b>: we should explain how to predict this</span></li></ul><ul class="c4 lst-kix_vmuch2tiypnh-2 start"><li class="c3 li-bullet-0"><span class="c1">as is, it’s completely UA defined</span></li></ul><ul class="c4 lst-kix_vmuch2tiypnh-1"><li class="c0 li-bullet-0"><span class="c1"><b>Yoav</b>: as an upperbound, time until next timer to fire?</span></li><li class="c0 li-bullet-0"><span class="c1"><b>Ryouske</b>: what about web audio or media that schedules rIC. Right now the spec doesn’t talk about them, and the only thing WebKit can implement is timer predictions.</span></li><li class="c0 li-bullet-0"><span class="c1"><b>Ross</b>: for Chrome.. We’re making a forward looking prediction</span></li></ul><ul class="c4 lst-kix_vmuch2tiypnh-2 start"><li class="c3 li-bullet-0"><span class="c1">… we only look at already queued timers</span></li><li class="c3 li-bullet-0"><span class="c1">… for each task queue that we have, take the min</span></li><li class="c3 li-bullet-0"><span class="c1">… we also take into account our compositor decision about next frame</span></li></ul><ul class="c4 lst-kix_vmuch2tiypnh-1"><li class="c0 li-bullet-0"><span class="c1"><b>Yoav</b>: if high priority task lands, tough..</span></li><li class="c0 li-bullet-0"><span class="c1"><b>Ross</b>: right, once we’ve started executing we can’t do anything. We support bailing before calling the callback if we see things have changed. But called code can query deadline and yield if the time period changes to zero.</span></li><li class="c0 li-bullet-0"><span class="c1"><b>Ryosuke</b>: is this behavior specced?</span></li><li class="c0 li-bullet-0"><span class="c1"><b>Ross</b>: yes, step 1 in 6.2</span></li><li class="c0 li-bullet-0"><span><b>Ryosuke</b>: It should explicitly say “if any task source’s task is being queued”. </span><span>I’ll file a bug about that.</span></li><li class="c0 li-bullet-0"><span class="c1"><b>Ross</b>: for the actual deadline, did you discuss it?</span></li><li class="c0 li-bullet-0"><span class="c1"><b>Yoav</b>: you mentioned tasks queued to run in the future</span></li><li class="c0 li-bullet-0"><span class="c1"><b>Ryosuke</b>: what are future scheduled tasks — e.g. web audio?</span></li></ul><ul class="c4 lst-kix_vmuch2tiypnh-2 start"><li class="c3 li-bullet-0"><span class="c1">I would probably just check for timer</span></li></ul><ul class="c4 lst-kix_vmuch2tiypnh-1"><li class="c0 li-bullet-0"><span class="c1"><b>Ross</b>: Media and webaudio are probably ones. But not highly familiar with them.</span></li><li class="c0 li-bullet-0"><span class="c1"><b>Yoav</b>: Can’t we find what those tasks are from Chromium’s and Gecko’s implementations?</span></li><li class="c0 li-bullet-0"><span class="c1"><b>Ross</b>: one gotcha here is that Webkit uses Grand-Central-Station, whereas for Firefox and Chrome we have our own scheduler. </span></li><li class="c0 li-bullet-0"><span class="c1"><b>Ben</b>: clarification on pending tasks</span></li><li class="c0 li-bullet-0"><span class="c1"><b>Ross</b>: HTML spec does not have a good definition</span></li></ul><ul class="c4 lst-kix_vmuch2tiypnh-2 start"><li class="c3 li-bullet-0"><span class="c1">In Chrome we have multiple prioritized queues, within the queue the tasks are not prioritized</span></li></ul><ul class="c4 lst-kix_vmuch2tiypnh-1"><li class="c0 li-bullet-0"><span class="c1"><b>Yoav</b>: and it’s hard to traceback the scheduling code from the scheduler itself, right?</span></li><li class="c0 li-bullet-0"><span class="c1"><b>Ryosuke</b>: we’d probably just look at the timer</span></li></ul><ul class="c4 lst-kix_vmuch2tiypnh-2 start"><li class="c3 li-bullet-0"><span class="c1">we can’t query raF, that’s owned by core animation</span></li></ul><ul class="c4 lst-kix_vmuch2tiypnh-1"><li class="c0 li-bullet-0"><span class="c1"><b>Ross</b>: we kinda have similar problem, we rely on browser process to tell us</span></li></ul><ul class="c4 lst-kix_vmuch2tiypnh-2 start"><li class="c3 li-bullet-0"><span class="c1">… we know what is expected, we speculate based on frame frequency</span></li></ul><ul class="c4 lst-kix_vmuch2tiypnh-1"><li class="c0 li-bullet-0"><span class="c1"><b>Ryosuke</b>: we can also do that, I guess</span></li><li class="c0 li-bullet-0"><span class="c1"><b>Ross</b>: … fundamentally, it’s a prediction and heuristic</span></li></ul><ul class="c4 lst-kix_vmuch2tiypnh-2 start"><li class="c3 li-bullet-0"><span class="c1">… the definitive bit here if+when task is scheduled, resetting to idle time to 0 should be specced more concretely</span></li></ul><ul class="c4 lst-kix_vmuch2tiypnh-1"><li class="c0 li-bullet-0"><span class="c1"><b>Yoav</b>: agreement on..</span></li></ul><ul class="c4 lst-kix_vmuch2tiypnh-2 start"><li class="c3 li-bullet-0"><span class="c1">set to 0 when task is scheduled</span></li><li class="c3 li-bullet-0"><span class="c1">Next rendering opportunity, even if speculative</span></li><li class="c3 li-bullet-0"><span class="c1">UA-defined timers to make the prediction</span></li></ul><ul class="c4 lst-kix_vmuch2tiypnh-1"><li class="c0 li-bullet-0"><span class="c1"><b>Ryosuke</b>: we should probably simplify the spec to talk about timers and next rendering opportunity (instead of talking about rAF), but drop e.g. discussion on web audio that we’re not properly defining</span></li><li class="c0 li-bullet-0"><span class="c1"><b>Ross</b>: rAF is defined in terms of next rendering opportunity, that sg. We should still keep rAF as a note.</span></li><li class="c0 li-bullet-0"><span class="c1"><b>Yoav</b>: ok, and get rid of audio, etc. </span></li><li class="c0 li-bullet-0"><span class="c1"><b>Yoav</b>: So to recap: We need to define the list of available timers, the next rendering opportunity, and UA-defined timers (and move all the current list as a note under that).</span></li><li class="c0 li-bullet-0"><span>AI (Ross): Specify setting deadline to zero</span><span class="c1">.</span></li><li class="c0 li-bullet-0"><span>AI (Yoav): Specify language around what the deadline value is</span></li></ul><p class="c5"><span class="c1"></span></p><p class="c5"><span class="c1"></span></p></div></div><div id="footer"><span>Published by <a target="_blank" title="Learn more about Google Drive" href="https://docs.google.com/">Google Drive</a></span><span class="dash">–</span><a href="https://docs.google.com/u/0/abuse?id=AKkXjoz0WL_NX9lJTNK0hdncoJhg6XYLpcCV-nfNUW8Hxb6lHWURu4cSWPSJTKU0Q6JYNGWUd5JHdrqLApbdCFU:0">Report Abuse</a></div><script type="text/javascript" nonce="">(function(){/*

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